Complicatedness
复杂性
🗣️ 情景例句
The expressway can lead you everywhere around this region.
高速公路能把你带到这个地区的任何地方。
Happy landing.
祝您早安 注：是送行者向上飞机的人说的告别语。
It is the natural frequency of emission of the hydrogen atoms in space and was discovered by us in 1951;
这个频率是空间氢原子释放的自然频率，是在1951年被人类发现的。